> For the complete documentation index, see [llms.txt](https://docs.witnesschain.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.witnesschain.com/archive/watchtower-protocol-architecture-v1/chains-supported.md).

# Chains supported

| L1 Chain                               | L2 Chains                                    |
| -------------------------------------- | -------------------------------------------- |
| Ethereum (Goerli) : Chain ID 5         | Optimism (OP Stack) op-goerli : Chain ID 420 |
|                                        | Base ( OP Stack ): Chain ID 8453             |
| Ethereum (sepolia) : Chain ID 11155111 | Optimism-Sepolia : Chain ID 11155420         |
|                                        | Base-Sepolia : Chain ID 84532                |